Eicon Networks DIVA LAN ISDN manual On the D-channel, To configure X.25 settings

Chapter Five: Minimizing ISDN Charges Configuring AO/DI 65

X.25 on the D-channel

During normal ISDN operation, the D-channel is used for signalling traffic purposes (call setup, call take down, caller ID, etc.) However, the full bandwidth of the D-channel is not needed for this. AO/DI takes advantage of the extra 9.6 bps that is available to establish an X.25 packet-switched connection to a remote site.

Therefore, to take advantage of AO/DI, the remote site must support X.25 and you must properly configure the following X.25 settings on the DIVA LAN ISDN Modem.

The following parameters should be set based on the values supplied by your ISP or remote corporate network.

•Local DTE address: Sets the X.25 DTE address assigned to the DIVA LAN ISDN Modem. Specify up to 15 digits.

•Maximum window size: Defines the maximum number of X.25 packets that can be outstanding (not acknowledged by the remote). When this number is reached, transmission is paused. Maximum window size can never be exceeded. If a larger window size is requested when the call is established, it is negotiated downward so that the Maximum window size is respected.

•Default window size: The window size used when a X.25 call is made. This value cannot be larger than the value of Maximum window size.

•Maximum packet size: The maximum size of an X.25 packet. Maximum packet size can never be exceeded. If a larger packet size is requested when the call is established, it will be negotiated down- ward so that the Maximum packet size is respected.

•Default packet size: The packet size used when a X.25 call is made. This value cannot be larger than the value of Maximum packet size.

•Number of VCs: Specify the number of two-way virtual circuits supported on your D-channel. The DIVA LAN ISDN Modem supports up to four VCs.

•ISDN TEI type: Determines how TEI assignment takes place.

•Dynamic: TEIs are dynamically assigned by the switch.

•Shared: Enables TEI sharing. Some switches only make two TEIs available for an ISDN line. Therefore, enable this option if you need three dynamically assigned TEIs (two B and one D). This shares the TEI between channels B1 and D. Requires AO/DI.

•Static: Lets you manually specify the TEI assignment for the D-channel.

•Static TEI number: If static was selected for ISDN TEI type, enter the TEI number you want to assign to the D-channel.

To configure X.25 settings

1.Click Connection on the menu bar. You will see the following page:

2.Set the Remote X.25 address parameter to the address of the remote site you want to communicate with.